Water is the cheapest drink. And it is also ______.
A．healthierB．healthiest
C．the healthierD．the healthiest
D

試題分析：句意:水是最便宜的飲料，而且它也是最健康的。healthy 健康的，是一個(gè)形容詞；healthier 是它的比較級(jí)形式；healthiest是它的最高級(jí)形式。根據(jù)句意和句中的the cheapest可知，水不只是最便宜的，也是最健康的，故也應(yīng)該用最高級(jí)形式，故選D。
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